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From: Richard Stallman <rms@gnu.org>
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Subject: Re: string-match doesn't honor anchor when START is nonzero
Date: Wed, 26 Jan 2000 07:42:12 -0700 (MST)
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    Is it expected that this would evaluate to nil?  (it does)

      (string-match "^j" " j" 1)

That is correct.  The argument 1 means to look for a match starting no
earlier than position 1, but the criterion for a match does not treat
position 1 as the start of a line if it is not one.

    If returning `nil' is the intended behavior, then there's a bug in
    mail-utils.el (rmail-dont-reply-to) because it seems to expect `1' and
    fails when it gets the `nil'.

Could you show which call to string-match is seems to have the problem?
It seems you have tracked this down already; I did a quick scan and
I don't see a bug of this kind.  We could debug it, but if you already
have done so, why not tell us what you know?